jpackage: support for environment variables in --java-options

[Michael Hall]

> On Sep 1, 2020, at 9:23 AM, Michael Hall <mik3hall at gmail.com> wrote:
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>> On Sep 1, 2020, at 2:07 AM, Serban Iordache <serban.iordache at gmail.com> wrote:
>> 
>> Not sure if it was clear from my previous messages, but what I am asking for is that the environment variables are expanded with the values they have on the user's machine (not on the machine where jpackage has been executed).  
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> It might be better at this point for the developers to respond. 
> 
> However, I believe on probably all platforms these options are included in a .cfg file that is bundled with the application. It is set at build time and not in anyway dynamic at runtime. Unless maybe you had some pre-launch process that modified that .cfg file?
> 
> On OS X I believe true application environment variables can be set in the Info.plist file, LSEnvironment entries if I remember correctly. A fork of the javapackager tool previously used in association with JavaFX was recently.mentioned on that list (JavaFX). I saw it included support for the PATH environment variable. On OS X using LSEnvironment as mentioned. I didn’t see this on the jpackage —help and wondered if any such support was currently included in jpackage. 
> 
> It is a valid point I was overlooking that some of this might be user dependent and changes to PATH or other environment variables might not be valid for all users unless care was taken. Again, difficult to take care with everything set at build time. 

Of course there is the code that reads the .cfg file. Thinking about it that could possibly be modified to resolve some dynamic variable type settings as it reads it.